Unreactive metals are found as uncombined metals in the Earth’s crust - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Question 3
Unreactive metals are found as uncombined metals in the Earth’s crust.
(a) Which of the following metals is found uncombined in the Earth’s crust?
A aluminium
B ... show full transcript
Worked Solution & Example Answer:Unreactive metals are found as uncombined metals in the Earth’s crust - Edexcel - GCSE Chemistry - Question 3 - 2016 - Paper 1
Step 1
Which of the following metals is found uncombined in the Earth’s crust?
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Answer
The correct answer is B: gold. Gold is an unreactive metal commonly found in its elemental form in the Earth’s crust.
Step 2
Complete the word equation for the reaction.
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Answer
iron oxide + carbon → iron + carbon dioxide.
Step 3
What happens to the iron oxide during this reaction?
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Answer
The correct answer is d: the iron oxide is reduced. During this reaction, iron oxide loses oxygen and is converted to iron.
Step 4
Give a reason why the starting mass of copper carbonate is always the same as the mass of the products formed.
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Answer
The mass is always conserved during the reaction, as stated by the law of conservation of mass. This means that the total mass of the reactants (copper carbonate) will equal the total mass of the products (copper oxide and carbon dioxide).
